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Put it this way...there is literally nothing for CP firewall to inspect (or any fw for that matter) if hosts are on the same subnet. As @Lloyd_Braun said, if its layer 2, then its more of a switch, not exactly a typical firewall. For firewall to do proper inspection, it would need to function on layer 3. As far as your question about the inspection if traffic does not pass through it, well, there is nothing to isnpect in that instance. Btw, its important to note it also depends how you configure threat prevention blades, because if its in monitor mode, those protections wont really be active in such instance.
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Andy
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